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Finding the Fourth Proportional to 20,715.47, 28,586.47 and 11,763.47

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Solution

The fourth proportional to 20,715.47, 28,586.47 and 11,763.47 is: 16,233.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.47 : 28,586.47 = 11,763.47 : x
  2. Step 2: Convert to fraction form
    20,715.47/28,586.47 = 11,763.47/x
  3. Step 3: Cross multiply
    20,715.47x = 28,586.47 × 11,763.47
  4. Step 4: Simplify right side
    20,715.47x = 336,276,082.25
  5. Step 5: Solve for x
    x = 336,276,082.25/20,715.47
  6. Step 6: Final answer
    x = 16,233.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.